MAC Audio Sub 108A Manual Del Usuario página 7

LOW-LEVEL OPERATION OF THE ACTIVE SUBWOOFER
The LINE IN (4) of the active subwoofer is used here. The REMOTE cable is connected as described in the chapter
"CONNECTING TO THE POWER SUPPLY". The LINE output or low-level subwoofer output of the car radio is
connected to the LINE IN (4) of the active subwoofer using an RCA cable. The switch (6) is set to "RCA". The high-
level input (5) is not used.
HIGH-LEVEL OPERATION OF THE ACTIVE SUBWOOFER (FIGURE 2)
The stereo high-level input (5) of the active subwoofer is used here. Please observe the correct polarity! The
active subwoofer can be connected to an amplifier or to the speaker outputs of a car radio. The automatic
switch-on mechanism of the high-level input is used here to automatically switch on the subwoofer. The switch
(6) must be set to "HIGH INPUT" to enable this; the REM input (2) is not connected. The low-level inputs (4) are
not used.
Important: High AND low-level operation cannot be used simultaneously!
SETTING THE INPUT RESPONSE
The input response can be adjusted to any car radio. Turn the volume control of your radio to the medium
setting and then set the input level control (3) in such a way as to produce a medium, average volume. This
setting normally ensures sufficient power reserves at an optimum noise voltage interval.
Warning: Reproduce loud test signals for a short time only so as to avoid damage to the speakers.
LOW-PASS FILTER WITH VARIABLE TRANSFER FREQUENCY
Set the desired transfer frequency on the low-pass filter control (1). The filter should be adjusted to the sound
requirements inside the audio system. The filter's edge steepness ensures the precise lowering of medium and
high-frequency ranges.
PHASE REGULATOR
The acoustic phase concerns a run-time correction, which can have a favorable influence on interference
phenomena in the transition band. The substantial wavelengths of bass sound waves can, depending on the
positioning of the subwoofer, give rise to falls in level in the frequency response because the sound waves from
the subwoofer and mid-woofer (e.g. a component system) obliterate each other. The positioning also influences
interference phenomena (e.g. standing waves).
The phase regulator (2) can be used to influence or eliminate unfavorable acoustic phenomena. Check whether
regulating the phase also has a favorable influence on your listening position.
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